/usr/lib/pkgconfig/botan-2.pc is in libbotan-2-dev 2.4.0-5ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | prefix=/usr/
exec_prefix=${prefix}
libdir=${prefix}/lib
includedir=${prefix}/include/botan-2
Name: Botan
Description: Crypto and TLS for C++11
Version: 2.4.0
Libs: -L${libdir} -lbotan-2 -fstack-protector -m64 -pthread
Libs.private: -lbz2 -lcrypto -ldl -llzma -lrt -lsqlite3 -ltspi -lz
Cflags: -I${includedir}
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